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EP1473039A1 - Utilisation d'inhibiteurs et d'oligonucleotitides antisense de BTK pour le traitement de la mastocytose proliferative - Google Patents

Utilisation d'inhibiteurs et d'oligonucleotitides antisense de BTK pour le traitement de la mastocytose proliferative Download PDF

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Publication number
EP1473039A1
EP1473039A1 EP03291066A EP03291066A EP1473039A1 EP 1473039 A1 EP1473039 A1 EP 1473039A1 EP 03291066 A EP03291066 A EP 03291066A EP 03291066 A EP03291066 A EP 03291066A EP 1473039 A1 EP1473039 A1 EP 1473039A1
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Prior art keywords
btk
mastocytosis
antisense
treating
cells
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EP03291066A
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German (de)
English (en)
Inventor
Christian Auclair
Frédéric SUBRA
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Centre National de la Recherche Scientifique CNRS
Universite Paris Sud Paris 11
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Centre National de la Recherche Scientifique CNRS
Universite Paris Sud Paris 11
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Priority to EP03291066A priority Critical patent/EP1473039A1/fr
Priority to US10/555,205 priority patent/US8227433B2/en
Priority to PCT/IB2004/001782 priority patent/WO2004096253A1/fr
Publication of EP1473039A1 publication Critical patent/EP1473039A1/fr
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
    • C12N15/113—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing
    • C12N15/1137—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing against enzymes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/42—Oxazoles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/005—Enzyme inhibitors
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y207/00—Transferases transferring phosphorus-containing groups (2.7)
    • C12Y207/10—Protein-tyrosine kinases (2.7.10)
    • C12Y207/10001—Receptor protein-tyrosine kinase (2.7.10.1)

Definitions

  • the present invention relates to a method for treating proliferative mastocytosis comprising administering a Bruton tyrosine kinase (BTK) inhibitor, a BTK antisense oligonucleotide or a vector expressing said antisense to a mammal in need of such treatment.
  • BTK Bruton tyrosine kinase
  • the invention is more particularly suited for treating category II, III and IV mastocytosis.
  • Mastocytosis are a very heterogeneous group of disorders characterized by an abnormal accumulation of mast cells in different tissues, mainly in the skin and the bone marrow, but also in spleen, liver, lymph nodes, and the gastrointestinal tract, depending on the nature of the disease. They can affect humans of either sex at any age.
  • Neoplasms of mast cells MC
  • Acute mast cell neoplasms are designated as MC leukemia.
  • Chronic mast cell neoplasms may be localized or generalized.
  • Cutaneous mastocytosis is the commonest localized neoplasm and is often found in children in which it often remits and never relapses. Mastocytosis are usually acquired diseases, but some rare familial cases have been described.
  • mast cell neoplasms With regard to the extreme heterogeneity of mast cell neoplasms, it is important to classify these diseases.
  • One of the most used classification is the one by Metcalfe (Metcalfe, J Invest Dermatol. 96: 2S-4S, 1991) that distinguishes four categories of mastocytosis :
  • MC Mast cells
  • SCF Stem Cell Factor
  • Kit ligand Kit ligand
  • SL Steel factor
  • MCGF Mast Cell Growth Factor
  • SCF receptor is encoded by the protooncogene c-kit, that belongs to type III receptor tyrosine kinase subfamily (Boissan and Arock, J Leukoc Biol. 67: 135-48, 2000). This receptor is also expressed on others hematopoietic or non hematopoietic cells. Ligation of c-kit receptor by SCF induces its dimerization followed by its transphosphorylation, leading to the recruitement and activation of various intracytoplasmic substrates. These activated substrates induce multiple intracellular signaling pathways responsible for cell proliferation and activation (Boissan and Arock, 2000).
  • Mast cells are characterized by their heterogeneity, not only regarding tissue location and structure but also at the functional and histochemical levels (Aldenborg and Enerback., Histochem. J. 26: 587-96, 1994 ; Bradding et al. J Immunol. 155: 297-307, 1995 ; Irani et al, J Immunol. 147: 247-53, 1991 ; Miller et al, Curr Opin Immunol. 1: 637-42, 1989 and Welle et al, J Leukoc Biol. 61: 233-45, 1997).Differentiation, survival and proliferation of MC depend greatly on SCF (Torrey et al, 1990).
  • the receptor for SCF is c-kit, encoded by the protooncogene c-kit; it belongs to type III receptor tyrosine kinase subfamily (Baghestanian et al, 1996). Numerous studies have been performed regarding the neoplastic mechanism of mastocytosis, searching for genetic abnormalities of c-kit (mutation, deletion). The existence of such abnormalities was suggested because they were previously found in rodent or human leukemic MC lines. In human mastocytosis, mutations of c-kit have been described in vivo in various forms of mastocytosis (cutaneous mastocytosis, systemic indolent or systemic aggressive mastocytosis).
  • BTK is mainly known because it is implicated in B cell development, for a review see Maas A et al, Dev Immunol 2001;8(3-4):171-81. BTK is also considered to be involved in the degranulation of mast cells. For example, Hata D et al, J Exp Med 1998 Apr 20; 187(8): 1235-47 have shown the involvement of BTK in Fc ⁇ RI-dependent mast cell degranulation and cytokine production. Consequently, inhibitors of BTK are proposed in the art for the treatment of allergic disorders.
  • the invention provides a new therapeutic application for BTK inhibitors for the treatment of proliferative mast cells disorders. This discovery is based on the unexpectedly finding that BTK is strongly over-expressed in proliferative mast cells lines compared to normal mature mast cell lines.
  • the invention provides a new route for the treatment of proliferative mastocytosis and more particularly mast cell leukemia.
  • the present invention relates to a method for treating proliferative mastocytosis comprising administering a BTK inhibitor, a BTK antisense oligonucleotide or a vector expressing said antisense to a mammalian in need of such treatment.
  • the invention contemplates the above method using BTK inhibitors which can be selected for example from malononitrilamides and more particularly from leflunomide analogs such as :
  • the invention contemplates a method for treating mastocytosis comprising administering to a mammalian in need of such treatment a compound that is a selective, potent and non toxic inhibitor of BTK obtainable by a screening method which comprises :
  • This screening method can be practiced in vitro using standard biochemical techniques such as immunoprecipitation and western blot. Preferably, the amount of BTK phosphorylation is measured.
  • the invention contemplates a method for treating proliferative mastocytosis as depicted above wherein the screening is accomplished in vivo.
  • the screening comprises performing a proliferation assay with cells expressing a mutant c-kit (for example in the transphosphorylase domain), which mutant is a permanent activated c-kit, with a plurality of test compounds to identify a subset of candidate compounds targeting BTK, each having an IC50 ⁇ 10 ⁇ M, preferably an IC50 ⁇ 1 ⁇ M, by measuring the extent of cell death.
  • Cells that can be used in this regards can be selected from :
  • the extent of cell death can be measured by 3H thymidine incorporation, the trypan blue exclusion method or flow cytometry with propidium iodide. These are common techniques routinely practiced in the art.
  • the method of the invention can be practiced by administering a BTK antisense oligonucleotide.
  • Said antisense oligonucleotide may comprise at least 15, 25, 30, 35, 40 or 50 consecutive nucleotides of the human btk gene sequence accessible in genebank under the numbers NM_000061 (GI 4557376) or complementary sequences thereof.
  • such antisense molecule can target the start codon region, the coding region, or the 3'-untranslated region of the BTK gene, and is able to specifically hybridizes with one of said regions and inhibits the expression of BTK.
  • the antisense target the ATG region between nucleotide C 159 to T 180 of the NM_000061 sequence. More preferably, said antisense display the following sequence:
  • the antisense oligonucleotide may comprise at least one modified internucleoside linkage, for example a phosphorothioate linkage. It can also comprise at least one modified sugar moiety. Any chemical modification from the natural structure of oligonucleotide conferring an increased resistance to nucleases is encompassed.
  • RNA and DNA The normal backbone of RNA and DNA is a 3' to 5' phosphodiester linkage but is susceptible to be degraded by exo or endonucleases when injected.
  • Modified backbones elude this problem and include phosphorothioates, phosphorothioates, phosphorodithioates, phosphotriesters and alkyl phosphonates.
  • Other modified backbones include chain alkyl or cycloalkyl internucleoside linkages, and chain heteroatomic or heterocyclic internucleoside linkages, such as morpholino linkages, siloxane backbones, sulfite based backbones, sulfonate or sulfonamide backbones and amide backbones.
  • Antisense oligonucleotides according to the invention may also have inverted polarity such as a 3' to 3' linkage at the 3'-end.
  • inverted polarity such as a 3' to 3' linkage at the 3'-end.
  • the man skilled in the art is able to obtain such chemically modified oligonucleotides following the teachings contained in US 5,278,302, US 5,286,717, US 5,399,676, US 5,466,677, US 5,536,821, US 5,672,697, US 5,034,506, US 5,235,033, US 5,470,967, US 5,596,086, US 5,608,046 and US 5,677,439.
  • LNAs Locked Nucleic Acids
  • the antisense may also comprise modified nucleic acids such as 5-methylcytosine, 5-hydroxymethyl cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives of adenine and guanine, 2-propyl and other alkyl derivatives of adenine and guanine, 2-thio substituted uracil, thymine and cytosine, as well as 5-substituted uracils and cytosines, see US 3,687,808, US 5,830,653, US 5,763,588, and US 6,005,096.
  • modified nucleic acids such as 5-methylcytosine, 5-hydroxymethyl cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives of adenine and guanine, 2-propyl and other alkyl derivatives of adenine and guanine, 2-thio substituted uracil,
  • the antisense according to the invention can also be conjugated with at least one group enhancing to the bioavalability of the molecule including for example cholesterols, lipids, and phospholipids.
  • the invention embraces an antisense oligonucleotide as depicted above. It concerns an antisense targeting the start codon region, the coding region, or the 3'-untranslated region of the BTK gene, and capable of specifically hybridizing with one of said regions and inhibiting the expression of BTK.
  • the antisense oligonucleotide comprises at least 15, 20, 25, preferably at least 30, or 50 consecutive nucleotides of the human btk gene sequence accessible in genebank under the numbers NM_000061 (GI 4557376) or complementary sequences thereof.
  • the invention is aimed at such antisense molecule which target the ATG region between nucleotide C 159 to T 180 of the NM_000061 sequence. More preferably, said antisense display the following sequence:
  • It may comprise at least one chemical modification selected from modified internucleoside linkage, inverted polarity and nucleotide analogs as depicted above. It can also be conjugated with at least one group enhancing to the bioavalability of the molecule, such as cholesterols, lipids, and phospholipids.
  • the invention also relates to a vector for gene therapy expressing the above described antisense oligonucleotide.
  • the invention is aimed at the method mentioned above comprising administering either a BTK inhibitor, a BTK antisense oligonucleotide or a vector expressing said antisense for the treating proliferative mastocytosis in mammalian, especially in human and in dogs.
  • Category II, III and IV mastocytosis in human is especially contemplated.
  • the method according to the invention is useful for treating solitary mastocytoma in human as well as dog mastocytoma and some rare subtypes like bullous, erythrodermic and teleangiectatic mastocytosis, mastocytosis with an associated hematological disorder, such as a myeloproliferative or myelodysplastic syndrome, or acute leukemia, myeloproliferative disorder associated with mastocytosis, and mast cell leukemia.
  • an associated hematological disorder such as a myeloproliferative or myelodysplastic syndrome, or acute leukemia, myeloproliferative disorder associated with mastocytosis, and mast cell leukemia.
  • the invention embraces the use of the compounds, the antisense oligonucleotide or a vector as depicted above to manufacture a medicament for treating proliferative mastocytosis in mammalian, especially in human and in dogs.
  • Category II, III and IV mastocytosis in human is especially contemplated as well as dog mastocytoma.
  • the method according to the invention is useful for treating solitary mastocytoma in human as well as dog mastocytoma and some rare subtypes like bullous, erythrodermic and teleangiectatic mastocytosis, mastocytosis with an associated hematological disorder, such as a myeloproliferative or myelodysplastic syndrome, or acute leukemia, myeloproliferative disorder associated with mastocytosis, and mast cell leukemia.
  • an associated hematological disorder such as a myeloproliferative or myelodysplastic syndrome, or acute leukemia, myeloproliferative disorder associated with mastocytosis, and mast cell leukemia.
  • the method is applicable to the treatment of dog mastocyoma.
  • Spontaneous mast cell tumors are the most common malignant neoplasm in the dog, representing between 7% and 21% of all canine tumors, an incidence much higher than that found in humans. These tumors often behave in an aggressive manner, metastasizing to local lymph nodes, liver, spleen, and bone marrow.
  • the method is applicable to the treatment of mast cell leukemia in human.
  • compositions utilized in this invention may be administered by any number of routes including, but not limited to, oral, intravenous, intramuscular, intraarterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal means.
  • routes including, but not limited to, oral, intravenous, intramuscular, intraarterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal means.
  • routes including, but not limited to, oral, intravenous, intramuscular, intraarterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal means.
  • oral, intravenous and intramuscular route of administration are preferred.
  • these pharmaceutical compositions may contain suitable pharmaceutically-acceptable carriers comprising excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used pharmaceutically. Further details on techniques for formulation and administration may be found in the latest edition of Remington's Pharmaceutical Sciences (Maack Publishing Co., Easton, Pa.).
  • compositions for oral administration can be formulated using pharmaceutically acceptable carriers well known in the art in dosages suitable for oral administration.
  • Such carriers enable the pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions, and the like, for ingestion by the patient.
  • compositions for oral use can be obtained through combination of active compounds with solid excipient.
  • Suitable excipients are carbohydrate or protein fillers, such as sugars, including lactose, sucrose, mannitol, or sorbitol; starch from corn, wheat, rice, potato, or other plants; cellulose, such as methyl cellulose, hydroxypropylmethylcellulose, or sodium carboxymethylcellulose; gums including arabic and tragacanth; and proteins such as gelatin and collagen.
  • disintegrating or solubilizing agents may be added, such as the cross-linked polyvinyl pyrrolidone, agar, alginic acid, or a salt thereof, such as sodium alginate.
  • Dragee cores may be used in conjunction with suitable coatings, such as concentrated sugar solutions, which may also contain gum arabic, talc, polyvinylpyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures.
  • suitable coatings such as concentrated sugar solutions, which may also contain gum arabic, talc, polyvinylpyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures.
  • Dyestuffs or pigments may be added to the tablets or dragee coatings for product identification or to characterize the quantity of active compound, i.e., dosage.
  • compositions which can be used orally include capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a coating, such as glycerol or sorbitol.
  • Push-fit capsules can contain active ingredients mixed with a filler or binders, such as lactose or starches, lubricants, such as talc or magnesium stearate, and, optionally, stabilizers.
  • the active compounds may be dissolved or suspended in suitable liquids, such as fatty oils, liquid, or liquid polyethylene glycol with or without stabilizers.
  • compositions suitable for parenteral administration may be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks' solution, Ringer's solution, or physiologically buffered saline.
  • Aqueous injection suspensions may contain substances which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran.
  • suspensions of the active compounds may be prepared as appropriate oily injection suspensions.
  • Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate or triglycerides, or liposomes.
  • Non-lipid polycationic amino polymers may also be used for delivery.
  • the suspension may also contain suitable stabilizers or agents which increase the solubility of the compounds to allow for the preparation of highly concentrated solutions.
  • the pharmaceutical composition may be provided as a salt and can be formed with many acids, including but not limited to, hydrochloric, sulfuric, acetic, lactic, tartaric, malic, and succine, acids, etc. Salts tend to be more soluble in aqueous or other protonic solvents than are the corresponding free base forms.
  • the preferred preparation may be a lyophilized powder which may contain any or all of the following: 1-50 mM histidine, 0. 1%-2% sucrose, and 2-7% mannitol, at a pH range of 4.5 to 5.5, that is combined with buffer prior to use.
  • compositions suitable for use in the invention include compositions wherein BTK inhibitors are contained in an effective amount to achieve the intended purpose.
  • the determination of an effective dose is well within the capability of those skilled in the art.
  • a therapeutically effective dose refers to that amount of active ingredient, which ameliorates the symptoms or condition.
  • Therapeutic efficacy and toxicity may be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., ED50 (the dose therapeutically effective in 50% of the population) and LD50 (the dose lethal to 50% of the population).
  • the dose ratio of toxic to therpeutic effects is the therapeutic index, and it can be expressed as the ratio, LD50/ED50.
  • Pharmaceutical compositions which exhibit large therapeutic indices are preferred.
  • the invention is directed to a composition comprising a BTK inhibitor for topical application.
  • a composition comprising a BTK inhibitor for topical application.
  • Such composition is adapted for treating skin disorders such as solitary mastocytoma and bullous, erythrodermic and teleangiectatic mastocytosis.
  • compositions according to the invention may be presented in all forms normally used for topical application, in particular in the form of a gel, paste, ointment, cream, lotion, liquid suspension aqueous, aqueous-alcoholic or, oily solutions, or dispersions of the lotion or serum type, or anhydrous or lipophilic gels, or emulsions of liquid or semi-solid consistency of the milk type, obtained by dispersing a fatty phase in an aqueous phase or vice versa, or of suspensions or emulsions of soft, semi-solid consistency of the cream or gel type, or alternatively of microemulsions, of microcapsules, of microparticles or of vesicular dispersions to the ionic and/or nonionic type.
  • These compositions are prepared according to standard methods.
  • composition according to the invention comprises any ingredient commonly used in dermatology and cosmetic. It may comprise at least one ingredient selected from hydrophilic or lipophilic gelling agents, hydrophilic or lipophilic active agents, preservatives, emollients, viscosity enhancing polymers, humectants, surfactants, preservatives, antioxidants, solvents, and fillers, antioxidants, solvents, perfumes, fillers, screening agents, bactericides, odor absorbers and coloring matter.
  • oils which can be used in the invention mineral oils (liquid paraffin), vegetable oils (liquid fraction of shea butter, sunflower oil), animal oils, synthetic oils, silicone oils (cyclomethicone) and fluorinated oils may be mentioned.
  • Fatty alcohols, fatty acids (stearic acid) and waxes (paraffin, carnauba, beeswax) may also be used as fatty substances.
  • glycerol stearate, polysorbate 60 and the PEG-6/PEG-32/glycol stearate mixture are contemplated.
  • hydrophilic gelling agents carboxyvinyl polymers (carbomer), acrylic copolymers such as acrylate/alkylacrylate copolymers, polyacrylamides, polysaccharides such as hydroxypropylcellulose, clays and natural gums may be mentioned, and as lipophilic gelling agents, modified clays such as bentones, metal salts of fatty acids such as aluminum stearates and hydrophobic silica, or alternatively ethylcellulose and polyethylene may be mentioned.
  • hydrophilic active agents proteins or protein hydrolysates, amino acids, polyols, urea, allantoin, sugars and sugar derivatives, vitamins, starch and plant extracts, in particular those of Aloe vera may be used.
  • agents As lipophilic active, agents, retinol (vitamin A) and its derivatives, tocopherol (vitamin E) and its derivatives, essential fatty acids, ceramides and essential oils may be used. These agents add extra moisturizing or skin softening features when utilized.
  • a surfactant can be included in the composition so as to provide deeper penetration of the ingredients of the BTK inhibitor.
  • the invention embraces penetration enhancing agents selected for example from the group consisting of mineral oil, water, ethanol, triacetin, glycerin and propylene glycol; cohesion agents selected for example from the group consisting of polyisobutylene, polyvinyl acetate and polyvinyl alcohol, and thickening agents.
  • compounds with penetration enhancing properties include sodium lauryl sulfate (Dugard, P. H. and Sheuplein, R. J., "Effects of Ionic Surfactants on the Permeability of Human Epidermis: An Electrometric Study," J. Ivest. Dermatol., V.60, pp. 263-69, 1973), lauryl amine oxide (Johnson et. al., US 4,411,893), azone (Rajadhyaksha, US 4,405,616 and 3,989,816) and decylmethyl sulfoxide (Sekura, D. L.
  • a second class of chemical enhancers are generally referred to as co-solvents. These materials are absorbed topically relatively easily, and, by a variety of mechanisms, achieve permeation enhancement for some drugs.
  • Ethanol (Gale et. al., U.S. Pat. No. 4,615,699 and Campbell et. al., U.S. Pat. Nos. 4,460,372 and 4,379,454), dimethyl sulfoxide (US 3,740,420 and 3,743,727, and US 4,575,515), and glycerine derivatives (US 4,322,433) are a few examples of compounds which have shown an ability to enhance the absorption of various compounds.
  • the invention is also directed to a method for treating category IV mastocytosis including mast cell leukemia, comprising administering a BTK inhibitor as defined above or a BTK antisense or a vector expressing said antisense and a compound selected from 2-Chloro-2'-desoxyadenosine and analogs thereof to a mammalian in need of such treatment.
  • the invention also contemplates a product comprising a BTK inhibitor, a BTK antisense or a vector expressing said antisense and at least one compound selected from 2-Chloro-2'-desoxyadenosine and analogs thereof for a separate, sequential or simultaneous use for treating category IV mastocytosis including mast cell leukemia as well as dog mastocytoma.
  • 2-Chloro-2'-desoxyadenosine (2-CDA) Cladribine, Merck Index (12th ed.) # 2397 has the following formula :
  • the invention also relates to a method as mentioned above, comprising administering a BTK inhibitor, a BTK antisense or a vector expressing said antisense and IFN ⁇ to a human in need of such treatment.
  • the invention also contemplates a product comprising a BTK inhibitor, a BTK antisense or a vector expressing said antisense and IFN ⁇ for a separate, sequential or simultaneous use for treating systemic forms of mastocytosis, especially category III mastocytosis.
  • Example 1 cDNA expression arrays of normal mast cells versus proliferating mast cells.
  • the purpose of the research conducted in frame with the present invention was to identify genes that are over-expressed in mast cell lines displaying mutations on the c-kit receptor. Indeed, mutation in the c-kit receptor is responsible for abnormal proliferation of mast cells, ultimately leading to mastocytosis for which the Applicant filed US 60/301,406.
  • the idea underlying the invention is to find other targets for depleting proliferative mast cells. In case where a given over-expressed gene is shown to be involved in the regulation or the proliferation of mast cells, it becomes a good candidate as pharmacological target.
  • Transcriptomes of CD34+ cells, immature hematopoietic cells that are differentiating, normal mature mast cells and mast cells bearing mutations on the c-kit receptors were performed in this regard.
  • the most striking result of the above differential transcriptome is the observation of a strong specific over-expression of the Bruton's Tyrosine Kinase (BTK) in the HMC-1 cell line.
  • BTK Bruton's Tyrosine Kinase
  • Example 2 BTK as a pharmacological target
  • antisense RNA to inhibit the expression of BTK in HMC-1, which is resistant to apoptosis.
  • Target cells which integrated this vector, show a significant decrease in the expression of BTK.
  • 4 clones we have noted a decrease of about 50 % of the expression of the BTK (see Figure 3).
  • Example 3 BTK antisense RNA abrogates BTK mediated apoptosis protection.
  • Transfection of cells is realized using Exgen® (Euromedex, France) following the instructions of the manufacturer. Basically, 500000 293 EBNA cells are plated / wells the day before transfection in six wells plates. The next day, a mixture of 0.5 ⁇ g of each vector is added to the cells together with Exgen® (7.5 ⁇ l/wells). 24 hours after transfection, the mixture is washed out and the cells are washed in PBS and cultured in fresh media. Culture supernatants containing viral particles are collected at 48, 72 and 96 hours after transfection, and gathered, filtered at 0.45 ⁇ m, concentrated by ultracentrifugation and then kept in PBS-BSA 1% at -80°C pour later processing.
  • Exgen® Euromedex, France
  • Supernatants are titrated by infecting NIH-3T3 cells plated at 50 000 cells / wells in 6 wells plates. Infection of NIH-3T3 cells is performed in presence of 4 ⁇ g/ml polybrene (Sigma, France). 24 hours after infection, the cells are washed in PBS and cultured in media containing geneticine (0.8 mg/ml). The viral load is determined by the number of colonies resistant to G418 after 8 days of culture.
  • HMC1 cells seeded the day before in 6 wells plates (10 5 cells/ well) are infected with increasing doses of LNCX or LNCX-AS BTK virus. 24 hours after infection, cells are washed in PBS and cultured in medium containing geneticine (1.2 mg/ml). After one week, we observed the formation of colonies resistant to geneticine and whose number depends on the quantity of virus used for infection.
  • a lower number of colonies of cells infected with LNCX-AS BTK relative to the number of colonies of cells infected with LNCX.
  • For equivalent quantity of virus we obtained between 5 to 10 fold less colonies of HMC resisting to G418 by infecting with the LNCX-AS BTK virus compared to the infection with the LNCX "empty".
  • the 10 to 20% surviving clones are those for which the antisense expression level is weak thereby maintaining a BTK expression level compatible with cellular survival.

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EP03291066A 2003-05-02 2003-05-02 Utilisation d'inhibiteurs et d'oligonucleotitides antisense de BTK pour le traitement de la mastocytose proliferative Ceased EP1473039A1 (fr)

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EP03291066A EP1473039A1 (fr) 2003-05-02 2003-05-02 Utilisation d'inhibiteurs et d'oligonucleotitides antisense de BTK pour le traitement de la mastocytose proliferative
US10/555,205 US8227433B2 (en) 2003-05-02 2004-05-03 Use of inhibitors and antisense oligonucleotides of BTK for treating proliferative mastocytosis
PCT/IB2004/001782 WO2004096253A1 (fr) 2003-05-02 2004-05-03 Utilisation d'inhibiteurs et d'oligonucleotides anti-sens de la btk dans le traitement des mastocytoses proliferatives

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